Use the EditNode to programmatically edit the giving node.
The EditNode method focuses the control's window, ensures that the giving node
fits the control's edit node, and edit the node's caption. The EditNode method
starts editing the giving node, if the control is enabled and visible, and the
node is editable ( Editable property ). The LayoutStartChanging(exEditNode)
event notifies your application once a node is being edited. The LayoutEndChanging(
exEditNode) event notifies your application once a node is edited. The Caption
property indicates the caption of the node being edited.